Changes to Version 1.0-1

   - Fixed bug in incRpca, perturbationRpca, secularRpca, sgapca, snlpca related to  missing data.

   - Added references to Brand (2002) in help pages of incRpca, perturbationRpca, secularRpca, sgapca, snlpca. 

   - Added Hervé Cardot as contributor.